C＃| Uri.CheckHostName(String)方法

Uri.CheckHostName(String)方法用于确定指定的主机名是否为有效的DNS名称。

Syntax: public static UriHostNameType CheckHostName (string name);
Here, it takes the host name to validate. This can be an IPv4 or IPv6 address or an Internet host name.

Return Value: This method returns a UriHostNameType which indicates the type of the host name. If the type of the host name cannot be determined or if the host name is null or a zero-length string, this method returns Unknown.

下面的程序说明了Uri.CheckHostName()方法的用法：

范例1：

// C# program to demonstrate the
// Uri.CheckHostName(string) Method
using System;
using System.Globalization;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing uri
        string uri = "www.geeksforgeeks.org";
  
        // using CheckHostName() method
        UriHostNameType value = Uri.CheckHostName(uri);
  
        // Displaying the result
        Console.WriteLine("Host type is: {0}", value);
    }
}

输出：

Host type is: Dns

范例2：

// C# program to demonstrate the
// Uri.CheckHostName(string) Method
using System;
using System.Globalization;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing uri
        string uri = "http:// localhost:3000";
  
        // using CheckHostName() method
        UriHostNameType value = Uri.CheckHostName(uri);
  
        // Displaying the result
        Console.WriteLine("Host type is: {0}", value);
    }
}

输出：

Host type is: Unknown

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.uri.checkhostname?view=netstandard-2.1